How do i adjust my shimano gears?
Answers:
On the deraillier there are 2 little screws, one to stop the chain coming off the side nearest the spokes and one to stop it on the other side.
I don't remember which is which because I have campagnolo which is slightly different but a quick look will tell you. all you have to do is put it in eighth gear and turn the nearest screw in a quarter of a turn, then flick it into ninth. If it still comes off keep turning the screw in quarter-turn increments.
That will stop the chain coming off, the grinding gears sounds you have a new bike or new it has been serviced and has new cables, and they have probably stretched. Look at where the cable enters the gear and turn the screw through which the cable passes and unscrew until it starts to bite and then try going through the gear range, it should improve, and then unscrew a tiny bit each time until it's perfect.
I have done this many times and never fails to work!
They can be tricky. Try a specialist shop.
Try looking distressed and go into the shop and tell them its a mates bike and you think you have damaged the gears. They may do it for free for you.if they are nice!
take it to your local bike shop
use yell.com to search for bike shops near you
There's a good description in the manual from Pacific Cycle
http://www.mongoose.com/hub/p5_ownersman.
Several reasons for this:
I'm an ex-bike mechanic so trust me!!
1) cable stretches over time leading to 'half-shifts' and a lot of skipping, especially on 'up-shifts'. Just wind the adjuster barrel ANTI-clockwise either at the gear lever or on the rear dérailleur.
2) If dropping off the chain wheel or rear gear cassette, the two adjuster or 'travel/limit' screws need to be adjusted SLIGHTLY.
Get a small screwdriver & adjust them a half turn at a time - checking your progress - and making sure you're going the right way!!. (It's easier in a workshop stand).
3) Front or rear dérailleur mechanisms have suffered impact damage - this can often twist or bend the parts, if you suspect this a local cycle shop is your best option.
If you are unsure about adjusting these parts yourself, most local shops will do it for a small fee - it literally is a 2 or 3 minute job!
Hope that fixes it!
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